Natural blue colors in cannabis arise from anthocyanins. Key methods:
- Choose genetics like Blueberry or Blue Dream strains.
- Lower nighttime temps to 55-65°F (13-18°C) in late flowering for 2-3 weeks.
- Keep soil pH slightly acidic (6.0-6.5).
- Provide high-intensity full-spectrum light; add UV-A sparingly.
Monitor for stress—extreme changes can reduce yield. Phenotype matters; not guaranteed.